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Old 01-12-2010, 06:24 AM   #1
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Plumbing vent was covered


We have lived here for 2.5 years. I was up on the roof two summers ago, and noticed the two plumbing vent stacks still had a plastic cover on them. I knocked them off, and of course, being old and brittle, some of it went down the tube. I was a little more careful with the second one.

Why would these be covered? We are on a septic system, but I called my in-law, who is out in the country as well, and he said his were not covered. Any ideas? Last roofing job just forgot to remove?

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Old 01-12-2010, 07:54 AM   #2
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Plumbing vent was covered


The vent must be exposed to the atmosphere. Did these covers still allow air to enter? If they did they may have been installed to prevent bird or insect nesting from blocking the vent.

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Old 01-12-2010, 08:47 AM   #3
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Plumbing vent was covered


Many Plumbers install a cap on the pipes going through the roof to avoid roofers throwing junk down them. This sounds childish, but happens. Also, they may have been left on after the drainage system test and inspection (by accident).
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Old 01-12-2010, 08:53 PM   #4
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Plumbing vent was covered


Quote:
Originally Posted by majakdragon View Post
They may have been left on after the drainage system test and inspection (by accident).
Bingo.
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Old 01-16-2010, 05:26 PM   #5
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Plumbing vent was covered


I think this happens more than people think! I've seen it so many times, Usually they are blue, around here anyway.


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Old 01-16-2010, 07:49 PM   #6
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Plumbing vent was covered


What happens is the plumber does the rough plumbing in a new house under construction and caps off the stacks and uses the inflatable rubber balls inside to seal everything up for the air test. The inspector comes out and inspects and passes it. The plumber removes the inflatable balls but if the weather is lousy that day, doesn't go up on the roof to bust out the plastic caps. Then a year or two down the road somebody is up on the roof for whatever reason and notices them and busts them out. It doesn't usually affect the operation of the drains where you would notice anything amiss.
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